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The simple answer is to take in more air. Often we yawn when we feel sleepy. The body is then relaxed and the breathing is shallow. Opening the mouth wide and taking in extra air in a yawn is a relax action. It is something you cannot control (through you may be able to stifle it, with great effort). The extra oxygen speed up the circulation and stretches the muscles. Perhaps, long ago, when our ancestors had to stay alert out in the wild, they yawned to keep themselves from falling asleep when there might be danger.
Sometimes we yawn when we are bored, which is almost same as being sleepy: the senses are not being stimulated, we relax and our breathing becomes shallow. The lungs demand more air, and our reflex action is to yawn.
Tell Me Why Questions for preschoolers | Tell Me Why science questions | Tell Me Why science questions and answers | Tell Me Why answers to hundreds of question | Tell Me Why Questions and Answers | Tell Me Why Questions | Questions on Tell Me Why |
The simple answer is to take in more air. Often we yawn when we feel sleepy. The body is then relaxed and the breathing is shallow. Opening the mouth wide and taking in extra air in a yawn is a relax action. It is something you cannot control (through you may be able to stifle it, with great effort). The extra oxygen speed up the circulation and stretches the muscles. Perhaps, long ago, when our ancestors had to stay alert out in the wild, they yawned to keep themselves from falling asleep when there might be danger.
Sometimes we yawn when we are bored, which is almost same as being sleepy: the senses are not being stimulated, we relax and our breathing becomes shallow. The lungs demand more air, and our reflex action is to yawn.
Tell Me Why Questions for preschoolers | Tell Me Why science questions | Tell Me Why science questions and answers | Tell Me Why answers to hundreds of question | Tell Me Why Questions and Answers | Tell Me Why Questions | Questions on Tell Me Why |
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